SB20261022169 - Use-after-free in Linux kernel ethernet spacemit driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98592)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to potentially cause a denial of service through DMA accesses to stale buffer addresses.

The vulnerability exists due to use-after-free in the SpacemiT Ethernet driver's emac_tx_mem_map() function when handling a fragment mapping failure during packet transmission. A local user can trigger transmission of fragmented packets that encounter this failure to leave hardware-owned descriptors referencing released DMA mappings, potentially causing invalid memory accesses and a system crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2d14720beb58870b15a52b236c3ab0be0e06e915
• https://git.kernel.org/stable/c/3001a103a367c6051c43aff363b6979c10e65347
• https://git.kernel.org/stable/c/ca9986cc824f2feb79b4a83e5f6f4c24c2140448